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This is where you'll learn to familiarize yourself with the controls, and actions of the game. The areas you'll encounter is actually pretty cut and dry with each level trying to explain a different aspect of the game that you will surely need to learn and hopefully master. Most of the NPCs you talk to will be pretty useless, sometimes though they will provide hints and bonuses to the game, so I highly suggest interacting with them every time you clear a chapter (or sometimes an area).
For this chapter, head on to the Orphanage and talk to one of the orphans there to receive the precious amount of 1 Prica. (Or not if you think its inconsequential). Then head on to the Devil's Stomach for your training sessions.
The first training mission will have 3 bats at your disposal. Obviously, this will be a cinch but for the beginners take a second to actually understand the tenets of the game as its your foundations that are really important.

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The second mission will have four bats this time. This is will also be the first map you'll encounter with the option to purify portals. I suggest purifying the portals as they give bonus pricas and of course will beef up your experience with regards to purifying. Remember, purification is your friend and it will do you well to learn how to successfully perform a purifying action.